<html>
  <head>
    <style></style>
    <meta name="viewport" content="width=device-width,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no">
    <style>
      .preview {
        margin-top: 50px;
        margin-left: 100px;
        border: 1px solid #cccccc;
      }
    </style>
  </head>
  <body>

    <iframe src="./parent.html" 
      frameBorder="0" class="preview" width="700", height="600"></iframe>

    <!-- <iframe src="http://127.0.0.1:8081/packages/board/examples/features/main.html" 
      frameBorder="0" class="preview" 
      width="600", height="500"></iframe> -->
  </body>
</html>